Correlation of the Jurassic Formations of North America, Exclusive of Canada

Imlay, Ralph Willard

doi:10.1130/0016-7606(1952)63[953:cotjfo]2.0.co;2

Cited by 94 publications

(45 citation statements)

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“…Oysters did not exist before Late Triassic time, and all known Triassic oysters are strongly ribbed. The Protancycloceras found in the upper part of the formation near Las Medias is very similar to P. hondense Imlay (Imlay, 1942) from the Portlandian of Cuba. The perisphinctids or berriasellids collected at Cuesta de Huasmozontla resemble the ammonites from the uppermost Jurassic strata near Mazapil, Zacatecas (R. W. Imlay, written communication, June 3, 1953).…”

Section: Jurassic System Las Trancas Formationsupporting

confidence: 52%

Geology of the Bernal-Jalpan area, Estado de Queretaro, Mexico

Segerstrom¹

1961

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Section: Jurassic System Las Trancas Formationsupporting

confidence: 52%

Geology of the Bernal-Jalpan area, Estado de Queretaro, Mexico

Segerstrom¹

1961

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“…The Entrada sandstone (Imlay, 1952; originally covered about 99,000 square miles and is present throughout most of the Colorado Plateau except in the southern part where the formation has been removed by pre-Dakota erosion ( fig. 55).…”

Section: Entrada Sandstonementioning

confidence: 99%

“…The Navajo sandstone others, 1936, 1947;Imlay, 1952) originally covered about 77,000 square miles in the western half of the Colorado Plateau ( fig. 53).…”

Section: Navajo Sandstonementioning

confidence: 99%

“…Rocks of the Kayenta formation others, 1936, 1947;Imlay, 1952) of Jurassic(?) age originally covered about 48,000 square miles in the central part of the Colorado Plateau (Harshbarger and others, 1951).…”

Section: Kayenta Formationmentioning

confidence: 99%

“…The Carmel is exposed chiefly in southeastern Utah and northeastern Arizona. The Twin Creek limestone (Spieker, 1946;Kinney and Rominger, 1947;Imlay, 1952) of the Uinta Mountains and Wasatch Mountains areas is considered to be equivalent to the Carmel formation.…”

Section: Carmeli Formationmentioning

confidence: 99%

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Distribution of elements in sedimentary rocks of the Colorado Plateau - a preliminary report

Newman¹

1962

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Unconformity generation and the shift from storm‐dominated to tide‐dominated processes in a Jurassic retroarc foreland basin: Insights from ichnology

Wroblewski

Morris

2023

The Depositional Record

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An enigmatic transition from the storm‐dominated, offshore to lower shoreface deposits of the Redwater Shale Member (Sundance Formation) to the overlying mixed tidal and aeolian Windy Hill Sandstone (Morrison Formation) in the Oxfordian of the North American Western Interior has long been a source of intrigue. Previously proposed drivers include the progradation of a large, tide‐dominated delta onto a storm‐dominated shelf, a complete reorganisation of the basin's hydrodynamics and climate, or the development of a regional unconformity (termed the J‐5). In south‐eastern Wyoming, the Redwater Shale is characterised as an offshore to distal shoreface deposit with glauconitic siltstones and sandstones punctuated by coquinoid and sandy tempestites and hosting a Cruziana Ichnofacies. The Windy Hill Sandstone, a time‐transgressive, sand‐rich, intertidal succession with classic Pteraichnus and stressed Skolithos Ichnofacies, sharply overlies the Redwater Shale and records an abrupt basinward shift in facies that accompanied at least tens of metres of sea‐level fall. New, detailed sedimentological, ichnological and architectural data collected across this transition in the study area provide fresh insights into the depositional history of these units and demonstrates the existence locally of a composite J‐5 unconformity. The unconformity developed as tectonically driven, prograding shoreline trajectories of the Redwater Shale gave way to degrading trajectories of the Windy Hill Sandstone, leading to a forced regression and formation of a regressive surface of marine erosion. The sharp juxtaposition of intertidal flat facies (Pteraichnus Ichnofacies) directly upon offshore to lower shoreface deposits (Cruziana Ichnofacies) is the key to recognising the unconformity and proves the value of the previously underutilised ichnological data.

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Correlation of the Jurassic Formations of North America, Exclusive of Canada

Cited by 94 publications

References 0 publications

Geology of the Bernal-Jalpan area, Estado de Queretaro, Mexico

Geology of the Bernal-Jalpan area, Estado de Queretaro, Mexico

Distribution of elements in sedimentary rocks of the Colorado Plateau - a preliminary report

Unconformity generation and the shift from storm‐dominated to tide‐dominated processes in a Jurassic retroarc foreland basin: Insights from ichnology

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